Try following the below instructions, if you haven't already tried them..

First Time Pairing to your Bluetooth Mobile PhoneWhen
you turn ON your Supertooth Light for the first time, it will
automatically go into Pairing mode ready to be found by devices in
Bluetooth searches. This will be the case until you have successfully
paired a phone. If you have already paired aphone, please go to the next section.1. Power ON your Supertooth Light. The Bluetooth Indicator (3) will turn a blinkingred/blue, The kit is now in pairing mode.2. Go to Point 3 in the next section, “Pairing to your Bluetooth Mobile phone”

Pairing to your Bluetooth Mobile PhonePair the SUPERTOOTH LIGHT to your Bluetooth mobile phone to create a “Pairing”link, or audio connection between the two. This has to be only done once when first connecting each new phone.1. From OFF, Press and Hold the Accept Button (1).2. While holding the Accept Button (1), switch the kit on (Press-and-release theMicrophone Shaft (5)).3. The Bluetooth Indicator (3) will turn a blinking red/blue, when you seethis, release the Accept Button (1). The kit is now in pairing mode.4.
While the kit is in pairing mode, access the Bluetooth menu of your
phone. Turn on the Bluetooth function then execute a Bluetooth search,
or discover. (See your phone’s manual for specific instructions.)5. When the phone displays the list of Bluetooth devices, select ST LIGHT.6. When the phone asks for the password, enter 0000 and press Ok.7. Set the ST LIGHT as a trusted/authorized device, if this is option in your phone.Important Note: The kit is now paired. Most phones automatically connect to thekit after pairing. With some phones you need to connect manually after pairing.Go back to Bluetooth > Paired devices > highlight ST LIGHT > pressOptions > then press Connect.When connected you may see the Bluetooth Symbol on your phone changeslightly, either inverting in color or changing to a headset or car symbol. The kitis now ready to use.Repeat steps 1 -7 above for each new phone you want to use with theSupertooth Light.

This
was copied from the user manual, which you may or may not have
already.. Here's a link to a .pdf file of the manual which you can also
save to your computer:

1 Suggested Answer

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Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.

Make sure the Supertooth 3 is turned off.You can tell if the Supertooth 3 is on or off by looking at the light on the front. If the light is on or flashing, then the Supertooth 3 is on: turn it off by holding down the Multi-Function button (the green button) for about 5 seconds, until you hear the voice announce that the Supertooth 3 is powering down.With the Supertooth 3 off, hold down the Multi-Function button for about 6 seconds, until the light on the front of the unit starts flashing red and blue.The Supertooth 3 will now prompt you to select your language: press the Multi-Function button when you hear your language spoken.The Supertooth 3 is now in pairing mode.

Step 2: Apple iPhone

Now you need to use your iPhone to search for Bluetooth devices:

Select Settings.Select General.Select Bluetooth.Wait for your phone to search for devices, then select your BlueAnt device from the list.If you are prompted for a PIN, enter 0000 (four zeros).Select Connect.

Make sure you have the most up-to-date firmware version. (Currently 1.6 in the United States). A full tutorial on how to connection Blue Ant Super tooth 3 to any Bluetooth interface is listed here. (Tward the bottom of the page, you can get the firmware updates at the top.)

Apple also offers a direct howto section on the iPhone 4 and how to pair it to bluetooth devices. Here.
Hope this solution helps you. If so please recommend it and rate it! :)

Go to this page, it will answer any question concerning the blueant .. including pairing to your phone .. activating your blueant etc http://www.blueant.com.au/index.phpalso gives you step by step instructions on codes, pairing etc

Turn the blueant off by holding the green button until it powers down. Put your phone in discover mode (refer to your phone's manual) then power the blueant back up but hold down the green button until the light starts flashing red and blue. Now you should be able to see it on the phone. I just discovered my Samsung I910 wouldn't pair unless I used the windows on screen keyboard instead of the Samsung on screen keyboard.

Hi - I had the same problem setting up my 3G S. Here's the solution. In "Settings/General" set the Bluetooth to "ON". Turn your ST3 OFF by holding the green button until she says it's Powering Down. Now press and hold the
green button ON until Language Selection (British
English) option. Select language by pressing green
button again. Next she will say "Device Found-Paring Successful-Enter password 0000". Enter 0000 and your phonebook will start downloading. There ya go!